Handle file drop events directly into the client

src/hdskins/java/com/voxelmodpack/hdskins/Later.java

@@ -7,6 +7,8 @@ public final class Later extends Thread {
     protected Later(int delay, Runnable runnable) {
         super(runnable);
         this.delay = delay;
+        setDaemon(true);
+        setName("Later#" + getId());
     }
 
     public static void performLater(int delay, Runnable callable) {

src/hdskins/java/com/voxelmodpack/hdskins/gui/GLWindow.java

@@ -0,0 +1,184 @@
+package com.voxelmodpack.hdskins.gui;
+
+import java.awt.Canvas;
+import java.awt.Frame;
+import java.awt.dnd.DropTarget;
+import java.awt.dnd.DropTargetListener;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowStateListener;
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.TooManyListenersException;
+
+import javax.imageio.ImageIO;
+import javax.swing.JFrame;
+
+import org.lwjgl.LWJGLException;
+import org.lwjgl.opengl.Display;
+import org.lwjgl.opengl.DisplayMode;
+
+import com.google.common.collect.Lists;
+import com.voxelmodpack.hdskins.Later;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.util.ResourceLocation;
+
+public class GLWindow implements Closeable {
+
+    static GLWindow instance = null;
+
+    public static GLWindow current() {
+        if (instance == null) {
+            instance = new GLWindow();
+        }
+        return instance;
+    }
+
+    private final DropTarget dt;
+
+    private final JFrame frame;
+
+    private DropTargetListener saved = null;
+
+    private final int frameX = 15;
+    private final int frameY = 36;
+
+    private final Minecraft mc = Minecraft.getMinecraft();
+
+    private int state = 0;
+
+    private GLWindow() {
+        int x = Display.getX();
+        int y = Display.getY();
+
+        int w = Display.getWidth() + frameX;
+
+        int h = Display.getHeight() + frameY;
+
+        Canvas canvas = new Canvas();
+
+        frame = new JFrame(Display.getTitle());
+        frame.setResizable(Display.isResizable());
+        frame.setLocation(x, y);
+        frame.setSize(w, h);
+        frame.getContentPane().setLayout(null);
+        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent windowEvent) {
+                Minecraft.getMinecraft().shutdown();
+            }
+        });
+        frame.addComponentListener(new ComponentAdapter() {
+            @Override
+            public void componentResized(ComponentEvent componentEvent) {
+                canvas.setBounds(0, 0, frame.getWidth() - frameX, frame.getHeight() - frameY);
+            }
+        });
+        frame.addWindowStateListener(new WindowStateListener() {
+            @Override
+            public void windowStateChanged(WindowEvent event) {
+                state = event.getNewState();
+                Later.performLater(1, () -> {
+                    canvas.setBounds(0, 0, frame.getWidth() - frameX, frame.getHeight() - frameY);
+                });
+            }
+        });
+        setIcons(frame);
+
+        frame.getContentPane().add(canvas);
+        frame.setVisible(true);
+
+        try {
+            Display.setParent(canvas);
+        } catch (LWJGLException e) {
+            e.printStackTrace();
+        }
+
+        if (Display.getWidth() == Display.getDesktopDisplayMode().getWidth()) {
+            frame.setExtendedState(Frame.MAXIMIZED_BOTH);
+        }
+
+        state = frame.getExtendedState();
+
+        if (mc.isFullScreen()) {
+            try {
+                Display.setFullscreen(true);
+            } catch (LWJGLException e) {
+                e.printStackTrace();
+            }
+        }
+
+        dt = new DropTarget();
+        canvas.setDropTarget(dt);
+    }
+
+    private final void setIcons(JFrame frame) {
+        try {
+            frame.setIconImages(Lists.newArrayList(
+                    ImageIO.read(mc.getResourceManager().getResource(new ResourceLocation("icons/icon_16x16.png")).getInputStream()),
+                    ImageIO.read(mc.getResourceManager().getResource(new ResourceLocation("icons/icon_32x32.png")).getInputStream())
+            ));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void setDropTargetListener(DropTargetListener dtl) {
+        if (saved != null) {
+            dt.removeDropTargetListener(saved);
+        }
+        if (dtl != null) {
+            try {
+                dt.addDropTargetListener(dtl);
+            } catch (TooManyListenersException e) { }
+            saved = dtl;
+        }
+    }
+
+    public static void dispose() {
+        if (instance != null) {
+            try {
+                instance.close();
+            } catch (IOException ignored) {
+            }
+        }
+    }
+
+    @Override
+    public void close() throws IOException {
+        mc.addScheduledTask(() -> {
+            try {
+                Display.setParent(null);
+            } catch (LWJGLException e) {
+                e.printStackTrace();
+            }
+
+            try {
+                if (mc.isFullScreen()) {
+                    Display.setFullscreen(true);
+                } else {
+                    if ((state & JFrame.MAXIMIZED_BOTH) == JFrame.MAXIMIZED_BOTH) {
+                        Display.setLocation(0, 0);
+                        Display.setDisplayMode(Display.getDesktopDisplayMode());
+                    } else {
+                        Display.setDisplayMode(new DisplayMode(mc.displayWidth, mc.displayHeight));
+                        Display.setLocation(frame.getX(), frame.getY());
+                    }
+                    Display.setResizable(false);
+                    Display.setResizable(true);
+                }
+            } catch (LWJGLException e) {
+                e.printStackTrace();
+            }
+
+            frame.setVisible(false);
+            frame.dispose();
+
+            instance = null;
+        });
+    }
+}

src/hdskins/java/com/voxelmodpack/hdskins/gui/GuiSkins.java

@@ -35,18 +35,15 @@ import net.minecraft.util.text.TextFormatting;
 import org.apache.commons.io.FilenameUtils;
 import org.apache.logging.log4j.LogManager;
 import org.lwjgl.BufferUtils;
-import org.lwjgl.opengl.Display;
 import org.lwjgl.opengl.GL11;
 import org.lwjgl.util.glu.GLU;
 
-import java.awt.Color;
-import java.awt.Window.Type;
-import java.awt.dnd.DropTarget;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.nio.DoubleBuffer;
 import java.nio.file.Path;
+
 import javax.annotation.Nullable;
 import javax.imageio.ImageIO;
 import javax.swing.*;
@@ -91,8 +88,6 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
     private float uploadOpacity = 0.0F;
     private float lastPartialTick;
 
-    private static JFrame fileDrop;
-
     private static GuiSkins instance;
 
     private MinecraftProfileTexture.Type textureType = SKIN;
@@ -177,7 +172,7 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
 
     @Override
     public void initGui() {
-        Later.performLater(1, this::enableDnd);
+        enableDnd();
 
         this.initPanoramaRenderer();
         this.buttonList.clear();
@@ -197,44 +192,9 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
     }
 
     private void enableDnd() {
-        if (fileDrop != null) {
+        GLWindow.current().setDropTargetListener((FileDropListener) files -> {
-            fileDrop.setVisible(true);
-            fileDrop.requestFocusInWindow();
-            fileDrop.setLocation(Display.getX(), Display.getY());
-            return;
-        }
-
-        fileDrop = new JFrame("Skin Drop");
-        fileDrop.setType(Type.UTILITY);
-        fileDrop.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
-        fileDrop.setResizable(false);
-        fileDrop.setTitle("Skin Drop");
-        fileDrop.setSize(256, 256);
-        fileDrop.setAlwaysOnTop(true);
-        fileDrop.getRootPane().setWindowDecorationStyle(JRootPane.NONE);
-        fileDrop.setLocation(Display.getX(), Display.getY());
-        fileDrop.getContentPane().setLayout(null);
-
-        JPanel panel = new JPanel();
-        panel.setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, Color.GRAY));
-        panel.setBounds(10, 11, 230, 205);
-        fileDrop.getContentPane().add(panel);
-        JLabel txtInst = new JLabel("Drop skin file here");
-        txtInst.setHorizontalAlignment(SwingConstants.CENTER);
-        txtInst.setVerticalAlignment(SwingConstants.CENTER);
-        panel.add(txtInst);
-
-        DropTarget dt = new DropTarget();
-        fileDrop.setDropTarget(dt);
-        try {
-            dt.addDropTargetListener((FileDropListener) files -> {
             files.stream().findFirst().ifPresent(instance::loadLocalFile);
         });
-            fileDrop.setVisible(true);
-            fileDrop.requestFocusInWindow();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
     }
 
     private void initPanoramaRenderer() {
@@ -247,14 +207,6 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
         localPlayer.releaseTextures();
         remotePlayer.releaseTextures();
         HDSkinManager.clearSkinCache();
-
-        Later.performLater(1, () -> {
-            if (!(Minecraft.getMinecraft().currentScreen instanceof GuiSkins)) {
-                if (fileDrop != null) {
-                    fileDrop.setVisible(false);
-                }
-            }
-        });
     }
 
     private void onFileOpenDialogClosed(JFileChooser fileDialog, int dialogResult) {
@@ -307,7 +259,7 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
                     this.selectedSkin = null;
                     this.localPlayer.releaseTextures();
                     this.openFileThread = new ThreadOpenFilePNG(this.mc, I18n.format("hdskins.open.title"), this::onFileOpenDialogClosed);
-                    this.openFileThread.setParent(fileDrop).start();
+                    this.openFileThread.start();
                     guiButton.enabled = false;
                 }
 

src/hdskins/java/com/voxelmodpack/hdskins/mixin/MixinMinecraft.java

@@ -0,0 +1,29 @@
+package com.voxelmodpack.hdskins.mixin;
+
+import java.io.IOException;
+
+import org.lwjgl.LWJGLException;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import com.voxelmodpack.hdskins.gui.GLWindow;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.crash.CrashReport;
+
+@Mixin(Minecraft.class)
+public class MixinMinecraft {
+
+    //public void displayCrashReport(CrashReport crashReportIn)
+    @Inject(method = "displayCrashReport(Lnet/minecraft/crash/CrashReport;)V", at = @At("HEAD"))
+    private void onGameCrash(CrashReport report, CallbackInfo info) {
+        GLWindow.dispose();
+    }
+
+    @Inject(method = "init()V", at = @At("RETURN"))
+    private void onInit(CallbackInfo info) throws LWJGLException, IOException {
+        GLWindow.current();
+    }
+}

src/hdskins/resources/hdskins.mixin.json

@@ -4,6 +4,7 @@
   "package": "com.voxelmodpack.hdskins.mixin",
   "refmap": "hdskins.mixin.refmap.json",
   "mixins": [
+    "MixinMinecraft",
     "MixinGuiMainMenu",
     "MixinImageBufferDownload",
     "MixinPlayerInfo",